塔里木河下游地区胡杨、柽柳液流变化研究——以英苏断面为例

Analysis on the Variation of Sap Flow of Populus euphratica Oliv.and Chinese Tamarisk at the Lower Reaches of Tarim River—A Case Study Along Yinsu Section

应用先进的PHYTALK植物生理生态监测系统对塔里木河下游英苏断面胡杨、柽柳的液流流速和相关环境因子日变化进行了监测。结果表明:胡杨和柽柳的液流速率日变化趋势相似,有明显昼夜节律变化,夜晚平稳,白天波动剧烈,呈多峰值;受植株水分储存的影响,液流早晨启动后,液流突然下降,达到一个低值后开始恢复;主要受降雨影响,距主河道100m处的胡杨枝平均液流速率低于距主河道200m处相同直径柽柳枝的平均流速;试验期,影响胡杨和柽柳液流的主导环境因子不同,每个因子都有各自的影响机制;植株液流的变化是植株自身生理调节和外界环境共同作用的结果。

The sap flow rate of Chinese tamarisk and Populus euphratica and relative environmental factors were observed by advanced PHYTALK system at Yinsu in the lower reaches of Tarim river, The results showed the following regularities： Daily variation of sap flows of Populus euphratica Oliv. and Chinese tamarisk had the similar trend, which showed obvious day and night rhythm, stable in the night compare to the daytime, and the diural variation of sap flow rate appeared multi - peaks ; Because of the exit of stored water in the plant. The sap flow rate reached a lower value after it started in the morning; Affected by the rain happened during the experimenta- tion, the average sap flow rate of Chinese tamarisk which was 200m away from the main watercourse was higher than that of Populus euphratica Oliv which was 100m away from the main watercourse; During the experimentation, environmental factors which influeneing Populus euphratica Oliv. and Chinese tamarisk were different. Furthermore, every factor had it＇s own influencing mechanism ; The variation of sap flow rate was determined by the fiscal regulation of the plant and the change of the environmental factors.